.main {
    background: url('../images/login-bg.jpg') no-repeat center;
    background-size: cover;
    overflow: hidden;
    position: relative;
    width: auto;
    height: 910px;
}
.content-box {
    width: 300px;
    height: 364px;
    background: rgba(180, 180, 180, .4);
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    padding: 18px 20px;
    z-index: 10;
    border-radius: 8px;

    h1 {
        text-align: center;
        color: #fff;
        margin: 10px 0;
        font-size: 24px;
    }

    .text {
        width: 100%;
        height: 38px;
        border: 1px solid #fff;
        background: #fff;
        text-indent: 1em;
        font-size: 14px;
        padding: 0;
        box-sizing: border-box;
        margin-top: 10px;
    }
    .submit {
        display: block;
        width: 100%;
        height: 38px;
        border: 1px solid #7fa900;
        margin-top: 30px;
        background: #7fa900;
        color: #fff;
        font-size: 18px;
        font-family: 'Microsoft YaHei';
        transition: background 0.4s;
        cursor: pointer;
        &:hover {
            background: #94cb00;
        }
    }
    .help-text {
        color: #e00;
        text-align: center;
    }
}